Look what a Zechus Yocheved and Miriam have; they get credit for thousands of Jews. Since they were Moser Nefesh to save the lives of those they should have killed, it’s as if they caused Klal Yisroel to multiply even more. They were called “Shifra & Puah” (how they took care of the babies) to show that their very essence (which a name signifies) was saving Jewish kids. When you go all out for something, then Hashem causes similar things to happen, and you get credit.
As if so many children of Klal Yisroel were created as a favor for Yocheved and Miriam! They Mamash became like mothers of Klal Yisroel. When a person goes all out in the task that’s before him, then he’ll be Zoche to much more in the same area. Avraham went all out to be a father to Aram, and he became: אַ ב הֲ מוֹן גּוֹיִּ ם a father to all nations.
It’s always K'dai (worthwhile) to aspire for all kinds of outstanding greatness. But a big Segula is to do the job before you with your whole heart.
